Rails - Mar 2014 - If you were to code a marketplace app like AirBnB today, what technology & stack would you use?

So having spent almost a year coding in RoR, I'm thinking of applying
"new
stuff" that I didn't get to use in my past projects.

Keeping in mind that I want to keep improving my skills and experience so 
that someday I can find that elusive remote RoR job, what would you suggest 
I use?

I have on my list:
1. CoffeeScript
2. Haml
3. Rspec and Capybara
4. Database other than PostgreSQL
5. Hosting other than Heroku
6. BitBucket

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